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Radiometric dating meteorites

How Does Radiometric Dating Work?, Ars Technica

In Western Australia, single zircon crystals found in younger sedimentary rocks have radiometric ages of as much as 4. Thousands of meteorites, which are fragments of asteroids that fall to Earth, have been recovered. There are more than 70 meteorites, of different types, whose ages have been measured using radiometric dating techniques. The results show that the meteorites, and therefore the Solar System, formed between 4.

The best age for the Earth comes not from dating individual rocks but by considering the Earth and meteorites as part of the same evolving system in which the isotopic composition of lead, specifically the ratio of radiometric dating meteorites to lead changes over time owing to the decay of radioactive uranium and uraniumrespectively.

Scientists have used this approach to determine the time required for the isotopes in the Earth's oldest radiometric dating meteorites ores, of which there are only a few, to evolve from its primordial composition, as measured in uranium-free phases of iron meteorites, to its compositions at the time these lead ores separated from their mantle reservoirs.

These calculations result in an age for the Earth and meteorites, and hence the Solar System, of 4.

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How can the radiometric dating of different meteorites determine the age of the earth? Wouldn't radioactive decay have already been occurring in all of those meteorites long before they hit earth? Wouldn't dating only show when the unstable nuclides in that meteorite were created, not when the earth was created? If you went and measured a decaying nuclide in a.

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Meteorites date the earth with a ± Ga Pb-Pb isochron called “​Radiometric Ages of Basaltic Achondrites and Their Relation to the. Many of your questions are answered in this question and associated answers: Why is Earth's age given by dating meteorites rather than its.